Advancements in utilizing solid wastes and contaminated soils to prepare sintered brick and ceramic granules
The industrial development generates increasing solid wastes in China.While,it comes a big challenge to treatment or recycle these solid wastes.The traditional solid waste treatment methods as landfill encounters many problems such as occupying and contaminating the land.Besides,China has large quantities of contaminated soil in brown field.Due to high remediation cost and immaturity of the treatment technologies,the treatment of heavily contaminated soils also attracts widespread concern.Since the solid wastes such as sludge and fly ash as well as the contaminated soil contain the main contents of SiO2 and Al2O3,which can be used for preparing sintered brick and ceramic granule,this is considered to be an effective method of recycling to reduce the release of heavy metals.During the sintering process,the liquefaction of minerals promotes the reaction between heavy metals and aluminosilicates,meanwhile,changes the valence states of heavy metals,which results in effective immobilization of heavy metals in bricks and ceramic grains.The immobilization ways include the formation of stable minerals,encapsulation in a solid matrix,and conversion to low-mobility valence states.This study summarized the research progress on the preparation of sintered brick and ceramic granule from solid wastes(sludge,fly ash,tailings)and contaminated soils that contain heavy metal contamination,outlined the process flow and process conditions,analyzed the factors affecting the stabilization of heavy metals,and made the summarize and prospect for the feasibility of preparing sintered brick and ceramic granule from solid wastes such as contaminated soils.
国家科技期刊平台
NSTL
万方数据
